The little things are the big things.
Whether personal habits or for businesses, it is always the little things done consistently that make the most difference.
Scaling the unscalable. Thoughtful comments on posts in a given online community. Picking up a dropped time in the supermarket for an elderly lady. Sending a bespoke email rather than an impersonal shotgun blast. Keeping in contact with an old colleague. Saying thank you.
These are the things that people looking in from the outside miss and then attribute results down to luck.
Serendipity cannot happen if you never interact on a personal level with anyone. At some stage, you have to put yourself out there and then keep doing so.
The biggest little thing you can do is to keep adding value to others and keep working on yourself daily.
"Search others for their virtues, thyself for thy vices." ~ Benjamin Franklin